[ 67.968964][ T26] kauditd_printk_skb: 6 callbacks suppressed [ 67.968974][ T26] audit: type=1800 audit(1567782545.160:28): pid=9740 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 68.827088][ T26] audit: type=1800 audit(1567782546.020:29): pid=9740 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 68.849164][ T26] audit: type=1800 audit(1567782546.020:30): pid=9740 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.146' (ECDSA) to the list of known hosts. syzkaller login: [ 251.028837][ T9893] IPVS: ftp: loaded support on port[0] = 21 [ 251.076123][ T9893] chnl_net:caif_netlink_parms(): no params data found [ 251.097515][ T9893] bridge0: port 1(bridge_slave_0) entered blocking state [ 251.105028][ T9893] bridge0: port 1(bridge_slave_0) entered disabled state [ 251.112603][ T9893] device bridge_slave_0 entered promiscuous mode [ 251.119941][ T9893] bridge0: port 2(bridge_slave_1) entered blocking state [ 251.127197][ T9893] bridge0: port 2(bridge_slave_1) entered disabled state [ 251.134719][ T9893] device bridge_slave_1 entered promiscuous mode [ 251.148505][ T9893] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 251.159050][ T9893] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 251.175882][ T9893] team0: Port device team_slave_0 added [ 251.182544][ T9893] team0: Port device team_slave_1 added [ 251.233697][ T9893] device hsr_slave_0 entered promiscuous mode [ 251.302221][ T9893] device hsr_slave_1 entered promiscuous mode [ 251.357739][ T9893] bridge0: port 2(bridge_slave_1) entered blocking state [ 251.365595][ T9893] bridge0: port 2(bridge_slave_1) entered forwarding state [ 251.372962][ T9893] bridge0: port 1(bridge_slave_0) entered blocking state [ 251.380102][ T9893] bridge0: port 1(bridge_slave_0) entered forwarding state [ 251.404451][ T9893] 8021q: adding VLAN 0 to HW filter on device bond0 [ 251.415391][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 251.423910][ T12] bridge0: port 1(bridge_slave_0) entered disabled state [ 251.431367][ T12] bridge0: port 2(bridge_slave_1) entered disabled state [ 251.439293][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 251.448992][ T9893] 8021q: adding VLAN 0 to HW filter on device team0 [ 251.458237][ T2684] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 251.466717][ T2684] bridge0: port 1(bridge_slave_0) entered blocking state [ 251.474128][ T2684] bridge0: port 1(bridge_slave_0) entered forwarding state [ 251.493432][ T9895] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 251.501769][ T9895] bridge0: port 2(bridge_slave_1) entered blocking state [ 251.508853][ T9895] bridge0: port 2(bridge_slave_1) entered forwarding state [ 251.516899][ T9895] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 251.527459][ T9895] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 251.535813][ T9895] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 251.544036][ T9895] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready executing program [ 251.552340][ T9895] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 251.560677][ T9893] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 251.575474][ T9893] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 356.711894][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 356.718558][ C0] rcu: 0-...!: (1 GPs behind) idle=396/1/0x4000000000000002 softirq=10196/10197 fqs=20 [ 356.728338][ C0] (t=10500 jiffies g=9865 q=35) [ 356.733256][ C0] rcu: rcu_preempt kthread starved for 10460 jiffies! g9865 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 [ 356.744330][ C0] rcu: RCU grace-period kthread stack dump: [ 356.750293][ C0] rcu_preempt R running task 29520 10 2 0x80004000 [ 356.758170][ C0] Call Trace: [ 356.761613][ C0] __schedule+0x755/0x1580 [ 356.766192][ C0] ? __sched_text_start+0x8/0x8 [ 356.771040][ C0] schedule+0xd9/0x260 [ 356.775091][ C0] schedule_timeout+0x486/0xc50 [ 356.779935][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 356.784858][ C0] ? usleep_range+0x170/0x170 [ 356.789518][ C0] ? trace_hardirqs_on+0x67/0x240 [ 356.794522][ C0] ? __kasan_check_read+0x11/0x20 [ 356.799529][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 356.805056][ C0] ? swake_up_one+0x60/0x60 [ 356.809541][ C0] rcu_gp_kthread+0x9b2/0x18c0 [ 356.814293][ C0] ? rcu_barrier+0x310/0x310 [ 356.819669][ C0] ? trace_hardirqs_on+0x67/0x240 [ 356.824773][ C0] ? __kasan_check_read+0x11/0x20 [ 356.829782][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 356.836014][ C0] ? __kthread_parkme+0x108/0x1c0 [ 356.841018][ C0] ? __kasan_check_read+0x11/0x20 [ 356.846038][ C0] kthread+0x361/0x430 [ 356.850093][ C0] ? rcu_barrier+0x310/0x310 [ 356.854682][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 356.860903][ C0] ret_from_fork+0x24/0x30 [ 356.865309][ C0] NMI backtrace for cpu 0 [ 356.869620][ C0] CPU: 0 PID: 9895 Comm: kworker/0:3 Not tainted 5.3.0-rc7+ #0 [ 356.877146][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 356.887255][ C0] Workqueue: ipv6_addrconf addrconf_dad_work [ 356.893212][ C0] Call Trace: [ 356.896498][ C0] [ 356.899407][ C0] dump_stack+0x172/0x1f0 [ 356.903722][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 356.909085][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 356.915309][ C0] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 356.921081][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 356.927084][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 356.932970][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 356.938078][ C0] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 356.943605][ C0] ? raise_softirq+0x138/0x340 [ 356.948384][ C0] update_process_times+0x32/0x80 [ 356.953399][ C0] tick_sched_handle+0xa2/0x190 [ 356.958245][ C0] tick_sched_timer+0x53/0x140 [ 356.963003][ C0] __hrtimer_run_queues+0x364/0xe40 [ 356.968983][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 356.974264][ C0] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 356.979789][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 356.985491][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 356.991720][ C0] hrtimer_interrupt+0x314/0x770 [ 356.996656][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 357.002192][ C0] apic_timer_interrupt+0xf/0x20 [ 357.007107][ C0] [ 357.010031][ C0] RIP: 0010:__list_del_entry_valid+0x26/0xf5 [ 357.015992][ C0] Code: 75 e8 eb b2 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 56 49 89 fe 48 83 c7 08 48 89 fa 41 55 48 c1 ea 03 41 54 80 3c 02 00 <0f> 85 a1 00 00 00 4c 89 f2 4d 8b 66 08 48 b8 00 00 00 00 00 fc ff [ 357.035722][ C0] RSP: 0018:ffff888090faed30 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 357.044309][ C0] RAX: dffffc0000000000 RBX: ffff8880934842f8 RCX: ffffffff85c64b39 [ 357.052267][ C0] RDX: 1ffff11012690860 RSI: ffffffff85c65006 RDI: ffff888093484300 [ 357.060228][ C0] RBP: ffff888090faed48 R08: ffff8880960ac280 R09: 0000000000000000 [ 357.068639][ C0] R10: fffffbfff134af8f R11: ffff8880960ac280 R12: dffffc0000000000 [ 357.076594][ C0] R13: ffff888093484000 R14: ffff8880934842f8 R15: 0000000000000000 [ 357.084636][ C0] ? hhf_dequeue+0xb9/0xa20 [ 357.089128][ C0] ? hhf_dequeue+0x586/0xa20 [ 357.093706][ C0] hhf_dequeue+0x5c5/0xa20 [ 357.098173][ C0] __qdisc_run+0x1e7/0x19d0 [ 357.102690][ C0] ? dev_queue_xmit+0x18/0x20 [ 357.107443][ C0] __dev_queue_xmit+0x16f1/0x3650 [ 357.112454][ C0] ? __local_bh_enable_ip+0x15a/0x270 [ 357.117809][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 357.123077][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 357.129361][ C0] ? br_nf_post_routing+0xd73/0x1d30 [ 357.134658][ C0] ? br_forward_finish+0x235/0x400 [ 357.139760][ C0] ? __kasan_check_read+0x11/0x20 [ 357.144774][ C0] ? __dev_queue_xmit+0x2b15/0x3650 [ 357.149955][ C0] dev_queue_xmit+0x18/0x20 [ 357.154438][ C0] ? dev_queue_xmit+0x18/0x20 [ 357.159106][ C0] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 357.165191][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 357.169782][ C0] br_forward_finish+0xfa/0x400 [ 357.174630][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 357.180613][ C0] ? br_fdb_add.cold+0x8c/0x8c [ 357.185381][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 357.191083][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 357.195656][ C0] __br_forward+0x641/0xb00 [ 357.200138][ C0] ? br_forward_finish+0x400/0x400 [ 357.205229][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 357.210770][ C0] deliver_clone+0x61/0xc0 [ 357.215165][ C0] maybe_deliver+0x2c7/0x390 [ 357.219740][ C0] br_flood+0x13a/0x3d0 [ 357.223945][ C0] br_dev_xmit+0x98c/0x15a0 [ 357.228433][ C0] ? br_poll_controller+0x10/0x10 [ 357.233448][ C0] ? netif_skb_features+0x6c2/0xb90 [ 357.238669][ C0] ? netdev_set_sb_channel+0xe0/0xe0 [ 357.243936][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 357.250230][ C0] ? validate_xmit_xfrm+0x43c/0xf10 [ 357.255420][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 357.260373][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 357.266610][ C0] dev_hard_start_xmit+0x1a3/0x9c0 [ 357.271884][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 357.278109][ C0] __dev_queue_xmit+0x2b15/0x3650 [ 357.283208][ C0] ? ndisc_constructor+0x1a5/0xb40 [ 357.288318][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 357.293583][ C0] ? ip6_finish_output2+0x1034/0x2520 [ 357.298937][ C0] ? __kasan_check_read+0x11/0x20 [ 357.303944][ C0] ? lock_downgrade+0x920/0x920 [ 357.308864][ C0] dev_queue_xmit+0x18/0x20 [ 357.313358][ C0] ? dev_queue_xmit+0x18/0x20 [ 357.318056][ C0] neigh_resolve_output+0x5a5/0x970 [ 357.323241][ C0] ip6_finish_output2+0x1034/0x2520 [ 357.328438][ C0] ? ip6_mtu+0x2e6/0x460 [ 357.332661][ C0] ? ip6_forward_finish+0x530/0x530 [ 357.337841][ C0] ? lock_downgrade+0x920/0x920 [ 357.342672][ C0] ? ip6_mtu+0x16f/0x460 [ 357.346908][ C0] __ip6_finish_output+0x444/0xa50 [ 357.352010][ C0] ? __ip6_finish_output+0x444/0xa50 [ 357.357273][ C0] ip6_finish_output+0x38/0x1f0 [ 357.362103][ C0] ip6_output+0x235/0x7c0 [ 357.366411][ C0] ? ip6_finish_output+0x1f0/0x1f0 [ 357.371505][ C0] ? __ip6_finish_output+0xa50/0xa50 [ 357.376770][ C0] ? ndisc_send_skb+0x803/0x1450 [ 357.381693][ C0] ndisc_send_skb+0xf29/0x1450 [ 357.386439][ C0] ? nf_hook.constprop.0+0x560/0x560 [ 357.391764][ C0] ? skb_set_owner_w+0x21b/0x320 [ 357.396689][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 357.402394][ C0] ndisc_send_ns+0x3a9/0x850 [ 357.406977][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 357.413200][ C0] ? ndisc_netdev_event+0x4e0/0x4e0 [ 357.418465][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 357.423653][ C0] ? trace_hardirqs_on+0x67/0x240 [ 357.428659][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 357.433838][ C0] addrconf_dad_work+0xb88/0x1150 [ 357.438854][ C0] ? addrconf_dad_completed+0xbb0/0xbb0 [ 357.444379][ C0] ? lock_acquire+0x190/0x410 [ 357.449038][ C0] ? trace_hardirqs_on+0x67/0x240 [ 357.454082][ C0] process_one_work+0x9af/0x1740 [ 357.459004][ C0] ? pwq_dec_nr_in_flight+0x320/0x320 [ 357.464367][ C0] ? lock_acquire+0x190/0x410 [ 357.469030][ C0] worker_thread+0x98/0xe40 [ 357.473524][ C0] ? trace_hardirqs_on+0x67/0x240 [ 357.478542][ C0] kthread+0x361/0x430 [ 357.482681][ C0] ? process_one_work+0x1740/0x1740 [ 357.487859][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 357.494171][ C0] ret_from_fork+0x24/0x30